CN109421300B - Method of building a tyre - Google Patents

Method of building a tyre Download PDF

Info

Publication number
CN109421300B
CN109421300B CN201811011903.4A CN201811011903A CN109421300B CN 109421300 B CN109421300 B CN 109421300B CN 201811011903 A CN201811011903 A CN 201811011903A CN 109421300 B CN109421300 B CN 109421300B
Authority
CN
China
Prior art keywords
bead
tire
carcass
hub
building drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201811011903.4A
Other languages
Chinese (zh)
Other versions
CN109421300A (en
Inventor
G.M.斯托伊拉
M.J.霍根
F.A.克米奇克
姚敏武
M.J.蒙特戈梅里
D.A.伦德尔
K.D.康格
P.R.莫拉莱斯
A.R.安多
R.D.瓦戈
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goodyear Tire and Rubber Co
Original Assignee
Goodyear Tire and Rubber Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Goodyear Tire and Rubber Co filed Critical Goodyear Tire and Rubber Co
Publication of CN109421300A publication Critical patent/CN109421300A/en
Application granted granted Critical
Publication of CN109421300B publication Critical patent/CN109421300B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
    • B29D30/246—Drums for the multiple stage building process, i.e. the building-up of the cylindrical carcass is realised on one drum and the toroidal expansion is realised after transferring on another drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/0016—Handling tyres or parts thereof, e.g. supplying, storing, conveying
    • B29D2030/0033—Rotating tyres or their components, e.g. carcasses, belt-tread packages, beads and the like, around their axis, i.e. for preventing deformation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/0061—Accessories, details or auxiliary operations not otherwise provided for
    • B29D2030/0066—Tyre quality control during manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • B29D2030/3214—Locking the beads on the drum; details of the drum in the bead locking areas, e.g. drum shoulders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/0061—Accessories, details or auxiliary operations not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2875/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as mould material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Tyre Moulding (AREA)

Abstract

The present invention relates to a method of building a tyre. A method for forming a tire having a first bead and a second bead on a tire building drum is disclosed. The method comprises the following steps: a green tire carcass is applied to a tire building drum having left and right hubs, each hub having a bead recess. The method comprises the following steps: the first and second beads are placed on the respective first and second bead recesses of the tire building drum, and then the carcass is inflated into engagement with the belt and tread assembly while at least one of the left and right hubs is moved in an axial direction at a controlled speed toward the respective other hub.

Description

Method of building a tyre
Technical Field
The present invention relates to building tires and more particularly to an improved method of building a tire.
Background
The manufacture of tires typically involves a tire building drum wherein a number of tire components are sequentially applied to the drum to form a cylindrical tire carcass. The tire building drum may be a flat drum, a one-shot drum, a one-segment drum, or a high crown tire building drum. In either case, the tire components are added successively to the drum to form a cylindrical segment of green carcass. A shaping operation is then carried out to transform the cylindrical green body into an annular green tyre. Typically, when forming a tire, a high pressure, low volume of shaping air is used, wherein the beads are rapidly joined together. Due to the large compressive forces and compound strains applied to the carcass to urge the components into the desired toroidal shape, pre-stresses are created in the green tire, particularly in the apex, bead area and sidewalls. These residual pre-stresses can result in non-uniformity, poor handling, and lower rolling resistance of the tire. Accordingly, an improved tire building process that minimizes tire building residual stress is desired, with the result being a desired improved tire.
Disclosure of Invention
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having left and right hubs, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein the two bead recesses are moved at a controlled speed toward each other.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction toward the respective other hub at a controlled speed, wherein the controlled speed is less than 20 mm/s.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction toward the respective other hub at a controlled speed, wherein the controlled speed is less than 15 mm/s.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction toward the respective other hub at a controlled speed, wherein the controlled speed is less than 10 mm/s.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction toward the respective other hub at a controlled speed, wherein the controlled speed is less than 6 mm/s.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having left and right hubs, each hub having a bead recess, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein no bead locking force is utilized.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having left and right hubs, each hub having bead recesses, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, further comprising the step of radially expanding the first and second bead-receiving mechanisms into engagement with the respective first and second beads at a low pressure.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads on the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein the carcass is inflated using an air flow having a flow coefficient Cv greater than 2.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads on the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein the carcass is inflated using an air flow having a flow coefficient Cv of 5 to 10.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having left and right hubs, each hub having bead recesses, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein the carcass is inflated with air at a pressure of less than 10 psi.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having left and right hubs, each hub having bead recesses, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein the carcass is inflated with air at a pressure of less than 5 psi.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having left and right hubs, each hub having bead recesses, placing first and second beads onto the respective first and second bead recesses of the tire building drum, and inflating the carcass into engagement with the belt and tread assembly while moving at least one of the left and right hubs in an axial direction at a controlled speed toward the respective other hub, wherein the carcass is inflated with air at a pressure of less than 3 psi.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first and second bead recesses to move freely in an axial direction.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads over the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first and second bead recesses to move freely in an axial direction, wherein both the first and second bead recesses are allowed to move freely in the axial direction.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first and second bead recesses to move freely in an axial direction, further comprising the step of inflating the carcass with low pressure, high volume air.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first and second bead recesses to move freely in an axial direction, wherein no bead locking force is utilized.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first and second bead recesses to move freely in an axial direction, wherein the bead recesses are radially expanded with a low bead locking force.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing free movement of at least one of the first and second bead recesses in the axial direction, wherein the carcass is inflated using an air flow having a flow coefficient Cv greater than 2.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first and second bead recesses to move freely in an axial direction, wherein the carcass is inflated using an air flow having a flow coefficient Cv of 5 to 10.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads over the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first bead recess and the second bead recess to move freely in an axial direction, wherein the carcass is inflated with air at a pressure of less than 10 psi.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads over the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first bead recess and the second bead recess to move freely in an axial direction, wherein the carcass is inflated with air at a pressure of less than 5 psi.
One or more embodiments of the present invention provide a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess, placing first and second beads on the respective first and second bead recesses, and inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first bead recess and the second bead recess to move freely in an axial direction, wherein the carcass is inflated with air at a pressure of less than 3 psi.
The present invention provides in a first aspect a method of forming a tire having first and second beads on a tire building drum, the method comprising the steps of: applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess, placing first and second beads on the respective first and second bead recesses of the tire building drum;
the carcass is inflated into engagement with the belt and tread assembly while at least one of the left and right hubs is moved in an axial direction at a controlled speed toward the respective other hub.
The present invention provides the following scheme:
1. a method for forming a tire having first and second beads on a tire building drum, the method comprising the steps of:
applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess;
placing a first bead and a second bead on respective first and second bead recesses of a tire building drum;
the carcass is inflated into engagement with the belt and tread assembly while at least one of the left and right hubs is moved in an axial direction at a controlled speed toward the respective other hub.
2. The method according to claim 1, characterized in that the two bead recesses are moved towards each other at a controlled speed.
3. The method according to claim 1, characterized in that the controlled speed is less than 20 mm/s.
4. The method according to claim 1, characterized in that the controlled speed is less than 15 mm/s.
5. The method according to claim 1, characterized in that the controlled speed is less than 10 mm/s.
6. The method according to claim 1, characterized in that the controlled speed is less than 6 mm/s.
7. The method of claim 1, wherein no bead locking force is used.
8. The method of claim 1, further comprising the step of radially expanding the first and second bead-receiving mechanisms at low pressure into engagement with the respective first and second beads.
9. Method according to claim 1, characterized in that the carcass is inflated using an air flow having a flow coefficient Cv greater than 2.
10. The method according to claim 1, characterized in that the carcass is inflated using an air flow having a flow coefficient Cv of 5 to 10.
11. The method of claim 1, wherein the carcass is inflated using air at a pressure of less than 10 psi.
12. The method of claim 1, wherein the carcass is inflated using air at a pressure of less than 5 psi.
13. The method of claim 1, wherein the carcass is inflated using air at a pressure of less than 3 psi.
14. A method for forming a tire having first and second beads on a tire building drum, the method comprising the steps of:
applying a green tire carcass onto a tire building drum having a first hub with a first bead recess and a second hub with a second bead recess;
placing the first bead and the second bead on the respective first and second bead recesses, inflating the carcass into engagement with the belt and tread assembly while allowing at least one of the first bead recess and the second bead recess to move freely in the axial direction.
15. The method of claim 14, wherein the first and second bead recesses are allowed to move freely in the axial direction.
16. The method of claim 14, further comprising the step of inflating the tire with a low pressure, high volume of air.
17. The method of claim 14, wherein no bead locking force is used.
18. The method of claim 14, characterized by radially expanding the bead recesses with a low bead locking force.
19. The method according to claim 14, characterized in that the carcass is inflated using an air flow having a flow coefficient Cv greater than 2.
20. The method according to claim 14, characterized in that the carcass is inflated using an air flow having a flow coefficient Cv of 5 to 10.
21. The method of claim 14, wherein the carcass is inflated using air at a pressure of less than 10 psi.
22. The method of claim 14, wherein the carcass is inflated using air at a pressure of less than 5 psi.
23. The method of claim 14, wherein the carcass is inflated using air at a pressure of less than 3 psi.
Definition of
To facilitate understanding of the present disclosure, the following terms are defined:
"apex" means the elastomeric filler located radially above the bead and between the plies and the turn-up plies.
"axial" and "axially" mean lines or directions parallel to or in line with the longitudinal axis of rotation of the tire building drum.
"bead" means a portion of a tire comprising an annular tensile member commonly referred to as a "bead core" surrounded by ply cords and shaped with or without other reinforcing elements such as flipper (chipper), chipper (chipper), apex, toe guard (toe guard), and chafer (chafer) to fit into a design rim.
"Belt structure" or "reinforcing belt" means at least one annular layer or ply of parallel cords, woven or unwoven, underlying the tread and not anchored to the beads.
"carcass" means an uncured laminate made from tire ply material and other tire components cut to the desired length, suitable for bonding or already bonded into a cylindrical or toroidal shape. Additional components may be added to the carcass before it is cured to make a molded tire.
"casing" means the tire carcass and associated tire components in addition to the tread.
"chafer" refers to a narrow strip of material placed around the outside of the bead to protect the plies from the rim, distribute deflection over the rim, and seal the tire.
"circumferential" means a line or direction extending along the perimeter of the surface of the annular tread, perpendicular to the axial direction.
"cord" means one of the reinforcing strands that make up the ply in the tire.
"Equatorial Plane (EP)" means the plane perpendicular to the axis of rotation of the tire and passing through the center of its tread.
"innerliner" means one or more layers of elastomer or other material that form the inner surface of a tubeless tire and contain the inflation fluid within the tire.
"insert" means an elastomeric member that functions as a reinforcing member typically located in the sidewall area of a tire.
"ply" means a continuous layer made of parallel cords coated with rubber.
"radial" and "radially" mean directions radially toward or away from the axis of rotation of the tire building drum.
"radial tire" means a belted or circumferentially-restricted pneumatic tire in which at least one ply has ply cords extending from bead to bead at cord angles between 65 and 90 degrees relative to the equatorial plane of the tire.
"shoulder" means the upper portion of the sidewall just below the tread edge.
"sidewall" means the portion of the tire between the tread and the bead.
"Tread" means a rubber component that, when bonded to a tire carcass, includes that portion of the tire that comes into contact with the road when the tire is normally inflated and under standard load.
"tread width" means the arc length of the tread surface in the axial direction, i.e., in a plane parallel to the axis of rotation of the tire.
Drawings
The invention will be described by way of example and with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a two-segment tire building drum.
FIG. 2 is a side cross-sectional view of the tire building drum shown in FIG. 1.
FIG. 3 is a cross-sectional view of the bead-receiving mechanism of the tire building drum shown in FIG. 2.
Fig. 4 and 5 are alternative embodiments of bead recesses.
FIG. 6 is a cross-sectional view of a green tire carcass installed in a bead recess of a tire drum.
FIG. 7 shows the carcass undergoing low pressure, high volume building prior to application of the tread and belt assembly.
FIG. 8 illustrates the inflation of a green tire carcass to the belt and tread assembly, with the green tire carcass shown in phantom.
Fig. 9 illustrates a tire formed by shaping and inflating, with the green tire carcass shown in phantom.
Detailed Description
The present invention provides a new and improved tire building drum that reduces residual stresses in the green tire carcass, resulting in an improved tire. The process provides for the tire plies and components to be shaped into a catenary configuration. A catenary structure is a structure that has no tensile or compressive reaction at the bottom of the structure and uniform strain along the length of the structure. In the case of a tire, the bead is the bottom of the structure and has a uniform strain over the length from the bead to the crown.
The tire building drum of the present invention allows the tire to be built into a catenary shape, producing a tire with a bead area and sidewalls made with minimal strain. The tire building drum allows the tire to be built such that the ply cords have a shortest cord length that is held in tension and not compressed. The tire building drum also prevents ply cord trisomy or unraveling of the cords due to cords being loaded in compression rather than tension.
A first embodiment of a two-stage tire building drum 100 of the present invention is shown in fig. 1. The tire building drum 100 has a central shaft 110 with a left hub 120' and a right hub 120 mounted on the central shaft 110. The left hub 120' is a mirror image of the right hub 120, and is otherwise mechanically identical except for orientation. As shown in fig. 1 and 2-4, each hub 120, 120' has an outer sleeve 130 that translates on the central axis 110 of the tire building hub. The outer sleeve 130 is connected to a T-bolt 133. T-bolt 133 has an inner end 137 that is secured to inner sleeve 139. Each inner sleeve 139 has an inner portion 141 that is threadedly engaged with the inner screw 114 for axial movement. Thus, the axial movement of each hub 120 is by controlled axial translation from the inner screw. The controlled axial translation or controlled speed is determined experimentally and is the rate of translation due to the carcass tensioning each bead during inflation under high-inflation, low-pressure air when the beads are freely slidable in the axial direction.
Each hub 120 further includes a bead lock mechanism 200 for receiving a bead region of a green carcass. Each bead lock mechanism 200 also includes a plurality of bead segments 210. Each bead section 210 may be expanded and contracted in a radial direction by a bead actuating cylinder 220. Each bead lock mechanism 200 preferably uses zero or low pressure. Preferably the bead lock cylinder pressure ranges from zero to less than 5 bar, more preferably from zero to 2 bar. The absent or substantially reduced bead pressure is reduced to limit bead compression and prevent cold forging of the toe guard and chafer beneath the bead bottom.
As shown in fig. 3, each bead section 210 has a bead recess 212 that facilitates rotation of the tire about the bead region during building. Each bead recess 212 gently holds and supports a bead without any bead locking force. The bead recess 212 as shown may have a flat bead-receiving surface 213 and inclined retaining sidewalls 215, 217. The flat bead receiving surface 213 may be at an angle in the range of 0 to 15 degrees from horizontal. The bead recesses 212 allow the tire to rotate about the bead wire so that the tire lower ply is pulled into tension and the apex is placed at the cured ply line angle. The inclined retaining sidewalls 215, 217 retain the beads in the bead recesses during tire formation, as shown in fig. 7-9. The recess 212 may have a curved receiving surface 515 and a retaining wall 510, as shown in fig. 4. Preferably, the recess 212 is formed of an elastomer, more preferably polyurethane. The curve 515 may be symmetrical or asymmetrical in shape. Fig. 5 illustrates that the recess 212 may have inclined retaining walls 611, 630. The flexible seal 214 is preferably integrally formed with the recess 212, as shown in FIG. 1.
Fig. 1-3 illustrate that the hub 120 may also include an optional forming plate 400. An optional forming plate 400 is received in a support bracket 410, as shown in fig. 2. The optional forming plate 400 may assist the forming process by engaging the intermediate sidewall of the tire during the forming process.
The first step of the catenary process of building a tire begins with the tire building drum being positioned in a starting position as shown in fig. 1. A cylindrical green tire carcass 610 is mounted on the bead mechanism 200 on each hub 120 such that the respective bead region 600 is received in the bead recess 212 of the respective hub, as shown in fig. 6.
The drum bead locking mechanism 200 may optionally be radially expanded to apply a low pressure on the beads sufficient to maintain the beads in their axial position and allow for a tighter airtight seal of the tire beads to the drum well seal and a faster inflation of the carcass when the tire is allowed to rotate about the bead area 600.
After the green tire bead is loaded, the next step is to form the green carcass using the catenary shaping process of the present invention. As the tire drum rotates, the green tire body 610 is rapidly and properly inflated with a low pressure, high volume of molding air, as shown in fig. 7. If the bead lock mechanism 200 is positioned slightly inboard of the tire bead spacing, the high volume of low pressure air will inflate the carcass and pull the bead inward to the shoulder of the bead recess. With a high volume of low pressure air, the "b" distance (radial distance between crown and bead) is increased and the carcass cord tension is kept at a low calculated value. Controlling the carcass tension during inflation, each hub is repositioned at a controlled speed, simulating the axial translation of the bead due to carcass tension if the hub is able to slide freely axially inward toward the opposite hub. The controlled speed is determined experimentally by measuring the axial translation rate of the bead under tension of the carcass during inflation while the bead is free to move axially. For aircraft tires, the controlled speed is in the range of 7-12mm/s, more preferably in the range of 8-10 mm/s. For passenger car tires, the controlled speed is in the range of 3-6mm/s, more preferably in the range of 4-5 mm/s. In an alternative embodiment, inner drive screw 114 is decoupled from the motorization, allowing free axial movement of the hub with bead traction forces generated by the catenary molding process.
FIG. 6 illustrates the position of the bead in the bead recess 210 of the green tire carcass when loaded onto the tire building drum. The assembled belt and tread assembly 650 is placed over the inflated carcass 600 as shown in FIG. 7, and the carcass is inflated with a high volume of low pressure air. The shape of the bead recess allows the tire to rotate about the bead area during inflation without requiring a high bead clamping force. The bead locking force may be zero or minimal. The carcass 600 is expanded to the assembled belt and tread assembly 650 as shown in fig. 8. When the sidewall angle is in the range of 55 degrees to 65 degrees and the crown of the carcass has contacted the inner belt building diameter, the tire is in a natural catenary shape with no tension, nor compression forces acting horizontally on the bead. Now both the carcass and the belt package share the same vertical centerline. As the bead is repositioned closer and closer to the vertical centerline and the tire is shaped narrower than the catenary shape, the shaping air creates a force that slides the bead outward in the bead recess, as shown in fig. 9.
The carcass is inflated using a high volume of low pressure air. The pressure preferably does not exceed 10psi, more preferably is less than 5psi, most preferably is less than 3 psi. The flow rate is increased from the prior art process such that the flow coefficient Cv is greater than 2. Preferably, the flow coefficient of the shaping air is greater than 4, and most preferably greater than 9.
Next, the tread and shoulder areas are stitched to the carcass (not shown) using a low stitching pressure. The pressing pressure is in the range of 350 to 800 mbar, more preferably in the range of 500 to 700 mbar. With low pressure, the roller presses start at the center of the tread and roll the tread in a circumferential manner, moving outward from the tire mandrel. The roller also engages the tread shoulder interface and the shoulder region. The finished tire is shown in fig. 9 with the initial green tire carcass shown in phantom. The tire is then removed from the tire building drum, completing the process. The green tire is then cured in a conventional manner.
The catenary forming process is advantageous in that it does not produce any "ply pull through" that causes dimensional distortion of the innerliner and the skim coat. The catenary shaping process with low bead locking force allows the outer, straight-twisted wire of the cable bead to rotate freely without any elastic energy of the inner wire around the cable bead. The catenary molding process with low bead locking force allows the outer lay wire, where the upper and lower plies are in contact and adhered to the wire bead, to rotate freely without any elastic energy of the inner wire around the wire bead. The catenary building process with low bead locking forces provides tension in the upper and lower carcass plies. But also the tension between the upper and lower plies.
While certain representative embodiments and details have been shown for the purpose of illustrating the subject invention, it will be apparent to those skilled in this art that various changes and modifications can be made therein without departing from the spirit or scope of the subject invention.

Claims (11)

1. A method for forming a tire having first and second beads on a tire building drum, the method comprising the steps of:
applying a green tire carcass onto a tire building drum having a left hub and a right hub, each hub having a bead recess;
placing a first bead and a second bead on respective first and second bead recesses of a tire building drum;
while moving at least one of the left and right hubs in an axial direction toward the respective other hub at a controlled speed of less than 20mm/s, the carcass is inflated into engagement with the belt and tread assembly such that the tire is shaped into a catenary configuration in which no bead locking force is used.
2. Method according to claim 1, characterized in that the two bead recesses are moved towards each other at a controlled speed.
3. The method according to claim 1, characterized in that the controlled speed is less than 15 mm/s.
4. The method according to claim 1, characterized in that the controlled speed is less than 10 mm/s.
5. The method according to claim 1, characterized in that the controlled speed is less than 6 mm/s.
6. The method of claim 1, further comprising the step of radially expanding the first and second bead receiving mechanisms at low pressure into engagement with the respective first and second beads.
7. Method according to claim 1, characterized in that the carcass is inflated using an air flow having a flow coefficient Cv greater than 2.
8. Method according to claim 1, characterized in that the carcass is inflated using an air flow having a flow coefficient Cv of 5 to 10.
9. The method of claim 1 wherein the carcass is inflated using air at a pressure of less than 10 psi.
10. The method of claim 1 wherein the carcass is inflated using air at a pressure of less than 5 psi.
11. The method of claim 1 wherein the carcass is inflated using air at a pressure of less than 3 psi.
CN201811011903.4A 2017-09-01 2018-08-31 Method of building a tyre Expired - Fee Related CN109421300B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/693,783 US20190070814A1 (en) 2017-09-01 2017-09-01 Method of building tires
US15/693783 2017-09-01

Publications (2)

Publication Number Publication Date
CN109421300A CN109421300A (en) 2019-03-05
CN109421300B true CN109421300B (en) 2021-09-03

Family

ID=65514804

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811011903.4A Expired - Fee Related CN109421300B (en) 2017-09-01 2018-08-31 Method of building a tyre

Country Status (3)

Country Link
US (1) US20190070814A1 (en)
CN (1) CN109421300B (en)
BR (1) BR102018067446A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10960627B2 (en) 2017-09-01 2021-03-30 The Goodyear Tire & Rubber Company Method of making a tire
IT201900023616A1 (en) * 2019-12-11 2021-06-11 Pirelli Forming drum for the production of vehicle wheel tires and method of checking the geometry of a forming drum for the production of vehicle wheel tires

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385620A (en) * 1990-11-02 1995-01-31 Sumitomo Rubber Industries, Ltd. Process and apparatus for building a green tire
CN100395100C (en) * 2002-05-07 2008-06-18 马塔多尔公司 Tyre building drum with turn-up device and method for production of green tyres
CN106142611A (en) * 2015-05-11 2016-11-23 东洋橡胶工业株式会社 Airtyred manufacture method, shaped device and pneumatic tire

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1789858A (en) * 1924-04-17 1931-01-20 Backdahl Gustaf Tire-building machine
US4325764A (en) * 1980-06-19 1982-04-20 The Goodyear Tire & Rubber Company Drum and method of shaping a radial tire
ES2233709T3 (en) * 2000-10-27 2005-06-16 Societe De Technologie Michelin ASSEMBLY DRUM FOR THE MANUFACTURE OF TIRES.
US6769468B2 (en) * 2001-09-21 2004-08-03 The Goodyear Tire & Rubber Company Tire building drum having expandable center section and independently expandable bead lock assemblies in the end sections
US6702977B2 (en) * 2002-01-28 2004-03-09 The Goodyear Tire & Rubber Company Expandable bead molding ring for a tire mold
US6827119B2 (en) * 2002-03-11 2004-12-07 The Goodyear Tire & Rubber Company Radially expansible tire assembly drum and method for forming tires
JP4420820B2 (en) * 2002-08-05 2010-02-24 株式会社ブリヂストン Tire molding drum and tire molding method
US10322554B2 (en) * 2013-08-29 2019-06-18 The Goodyear Tire & Rubber Company Tire building drum
US20150114571A1 (en) * 2013-10-29 2015-04-30 The Goodyear Tire & Rubber Company Uni-stage tire building drum
US20160176138A1 (en) * 2014-12-23 2016-06-23 The Goodyear Tire & Rubber Company Sleeveless tire building drum

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385620A (en) * 1990-11-02 1995-01-31 Sumitomo Rubber Industries, Ltd. Process and apparatus for building a green tire
CN100395100C (en) * 2002-05-07 2008-06-18 马塔多尔公司 Tyre building drum with turn-up device and method for production of green tyres
CN106142611A (en) * 2015-05-11 2016-11-23 东洋橡胶工业株式会社 Airtyred manufacture method, shaped device and pneumatic tire

Also Published As

Publication number Publication date
BR102018067446A2 (en) 2019-03-26
US20190070814A1 (en) 2019-03-07
CN109421300A (en) 2019-03-05

Similar Documents

Publication Publication Date Title
KR100991587B1 (en) A method and apparatus for forming an annular elastomeric tire component
CN1792622B (en) Method of making a tire using a high crown single-stage tire-building drum
JPH11314284A (en) Manufacture of tire
JP4294803B2 (en) Manufacturing method of carcass structure of automobile tire and carcass structure of automobile wheel tire
US6539998B2 (en) Process and drum for constructing a green tire
JPH11254906A (en) Tire for wheel of vehicle
CN109421300B (en) Method of building a tyre
CN109421304B (en) Method for manufacturing tire
CN109421301B (en) Tyre building drum
CN109421302B (en) Method of building a tyre
CN109421298B (en) Method of building a tyre
CN109421299B (en) Method for manufacturing tire
EP3450154B1 (en) Tire building drum and method of building a tire
EP2212102B1 (en) Method for manufacturing tyres for vehicle wheels
US3525654A (en) Method of manufacturing a radial tire and pneumatic tire manufactured thereby
EP1323517B1 (en) Method of making a pneumatic tyre
JP4399849B2 (en) Run-flat tire and method for producing the run-flat tire
EP3450153B1 (en) Tire building drum and method of building a tire
JP2005538865A (en) Tire manufacturing method and apparatus
US20200198276A1 (en) Method of building a tire with no bead turnup
EP2452809A1 (en) Segmented tire building core and method of making a tire
RU2311294C2 (en) Method of and device for manufacture of vehicle wheel pneumatic tires
US20090050252A1 (en) Method of manufacturing run-flat tire
KR20050083818A (en) Method and apparatus for manufacturing a pneumatic tyre for vehicle wheels

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20210903